Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 01 Jan 2015

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

11(7)

28(28)

34(-)

26(11)

0.4(4)

15(55)

South

5(3)

30(30)

26(-)

40(17)

0.4(4)

17(56)

East

7(4)

26(26)

11(-)

49(21)

0.3(3)

19(59)

West

2(2)

31(31)

14(-)

28(12)

0.5(5)

18(57)

Central

6(4)

29(29)

28(-)

63(27)

0.4(4)

15(54)

1-hr PM2.5 (µg/m3)b Readings on 01 Jan 2015

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

10

10

10

11

12

13

16

13

11

15

27

21

South

14

17

22

19

19

17

10

12

20

16

14

17

East

15

18

17

13

13

14

23

31

25

17

23

20

West

23

22

21

21

20

20

14

18

15

11

18

13

Central

13

20

20

18

15

20

9

8

14

14

14

12

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

22

16

18

18

13

18

16

17

13

14

14

-

South

26

25

23

19

19

13

14

13

15

13

11

-

East

29

16

23

19

17

15

16

17

18

20

20

-

West

20

18

25

13

19

13

14

17

18

15

20

-

Central

18

19

24

14

15

12

12

16

11

13

8

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
01 Jan 2015

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

53

55

56

57

56

56

55

55

55

55

57

56

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

59

59

62

59

58

55

54

54

54

55

54

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.